If you’re OK with sacrificing design over performance, the Mixcder Ghost Bluetooth headphones are a considerable alternative.
Many other app-based car keys are also vulnerable.
The MW65 are brilliant overall. They’re worth the high price tag, offering at once superior style, quality and functionality.
Gazabyte's review on Anker's Soundcore Flare 2, a waterproof Bluetooth portable speaker.
Don't let its looks fool you, these things kick ass.